Similarly but yet completely different I always positon the mouse cursor away from the text I'm reading, since I find the cursor distracting. Nowadays that sometimes has an annoying side effect: some news sites have video thumbnails in side columns. If the mouse cursors hovers over one of them for a few seconds, the browser opens the page with the full video. Gone is the article I was reading.

I don't understand what problem the developers were trying to solve with that feature/bug.